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I think this is humorous, and, in a way, brutal. Keep in mind it's not an official document from Postgres but rather just a guy who is big on Postgres writing a funny, and yes, snarky response to Uber. He makes some decent points, if not about the technologies themselves, about people switching to something more or less equivalent for reasons that could easily be interpreted as more gut reactions than solid business and tech necessities.

To me, Uber acted as though someone bought a Honda and it had some mechanical issues (and no seat heat), so he went apeshit, drove it off a cliff, then bought a Toyota thinking he will never have that problem again.